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HomeMy Site✈️Aircraft🚁HelicopterHelicopter Main Discussion › Took my engine apart -is the piston ring suppose to be loose on the piston?
10-27-2018 04:14 AM  8 months ago
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Infarcted

rrApprentice

downunder

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Took my engine apart -is the piston ring suppose to be loose on the piston?
Took apart my OS 37 and Webra 35 and found that after years of non- use, the piston ring is stuck down on the piston gap .What I want to know is can this be normal and still functional rather than about removal of the stuck down ring process? Thanks !
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10-27-2018 04:38 AM  8 months ago
ICUR1-2

rrElite Veteran

Ottawa, Ontario

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if it don't move and it should = WD-40
if it moves and it shouldn't = duct tape

spending time, paying attention
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10-27-2018 12:48 PM  8 months ago
Jeff polisena

rrElite Veteran

westpalmbeachflorida usa

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Use heat , lube and rubber hammer . Tap around piston on ring to loosen . Don’t pry on ring it can break free and snap . You might try squeezing with fingers first but don’t use any force with whatever you use .I stole it ,flew it and gave it back ;)
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10-27-2018 01:00 PM  8 months ago
dgoss999

rrApprentice

UK - Lancashire

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It should be free in the slot, but not be able to rotate around the piston. There should be a locating pin in the ring groove to stop the gap in the ring moving round and poking out of the inlet/exhaust/transfer ports in the cylinder liner.. To free also try an overnight soak for just the piston crown and ring in solvent or even brake fluid ..

DG
"Believe none of what you hear, and only half of what you see." • Benjamin Franklin
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10-27-2018 10:06 PM  8 months ago
Infarcted

rrApprentice

downunder

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Thanks for replies.Is Hoppes 9 solvent suitable as I read somewhere else ,I think RC Groups?
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10-27-2018 10:20 PM  8 months ago
JuanRodriguez

rrProfessor

The Villages, Florida

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Any penetrating solvent will work ..... Liquid Wrench would be another .....Been there, done that and old enough to know better.....
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10-28-2018 03:30 PM  8 months ago
utahbob

rrVeteran

St. George Utah

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"Dont spoil it..Kroil it"..never tried this stuff for breaking bolts loose..it might work for you..I wouldn't beat on it or pry.I do a great decending funnel!
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